[rakudo]:  More List revisions * Rework .kv, .exists, and .delete . * The changes to .delete cause t/spec/S29-array/delete.t to fail,   but I think the spectest is wrong and this implementation is correct.
[rakudo]:  More List revisions
* Rework .kv, .exists, and .delete .
* The changes to .delete cause t/spec/S29-array/delete.t to fail,
  but I think the spectest is wrong and this implementation is correct.


git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@27896 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

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